CN105458460A - Digital inverter welding machine and power-on self-detection method thereof - Google Patents
Digital inverter welding machine and power-on self-detection method thereof Download PDFInfo
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- CN105458460A CN105458460A CN201510893832.5A CN201510893832A CN105458460A CN 105458460 A CN105458460 A CN 105458460A CN 201510893832 A CN201510893832 A CN 201510893832A CN 105458460 A CN105458460 A CN 105458460A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
Abstract
The invention discloses a digital inverter welding machine. The digital inverter welding machine comprises a master chip circuit, a control circuit, an inverter loop circuit and an actual pulse width detection circuit which are connected in sequence. The invention further discloses a power-on self-detection method of the digital inverter welding machine. After the digital inverter welding machine is powered on, a pulse train is automatically output for self-detection; and when a loop is abnormal, the loop with a fault can be rapidly determined, and an IGBT is definitely prevented from being damaged.
Description
Technical field
The present invention relates to digital inverter type welder field, particularly relate to digital inverter type welder and startup self-detection method thereof.
Background technology
Electric welding machine is divided into simulation welding machine and Study of digital welding machine, the function of simulation welding machine realizes by many simulations and logic circuit, often increase a kind of function and all will increase a lot of components and parts, possess two or more functions and just need a lot of circuit board, not only cost is high, and Performance And Reliability sharply can decline with the increase of components and parts; The function of Study of digital welding machine realizes by software, and increase welding machine function and only need change its software, each functional module is separate, and increasing New function does not affect original function and performance completely; Along with popularizing of digital product, digital electric welding machine replaces simulation welding machine will become inevitable trend.
The startup self-detection mode of existing digital inverter type welder is generally detect at the current transformer in the former limit of transformer IGBT, the protection point voltage of machine is set again on control loop, when major loop is abnormal, primary current exceedes the current point for protection, and namely control loop is protected; Protection point electric current due to this mode needs to be arranged on the normal current point worked; it is passive for adding that overcurrent protection detects; therefore when protecting some work; the electric current often flowing through IGBT has reached to a certain degree; and control loop generally has certain delay; if the impact resistance of IGBT is not strong, then may there is the risk of damage.
Summary of the invention
The embodiment of the present invention provides digital inverter type welder and startup self-detection method thereof, to improve existing digital inverter type welder once loop exists fault, namely causes the problem that IGBT damages.
The invention discloses a kind of digital inverter type welder startup self-detection method, said method is:
After welding machine powers on, production burst group M1, controls self inversion circuit work;
Gather the primary current signal of inversion circuit output and the magnitude of voltage V of voltage signal, and convert above-mentioned primary current feedback signal to actual pulse group W2;
According to the magnitude of voltage V of above-mentioned voltage signal and the size of threshold voltage VH preset, and the difference of the pulsewidth W2 of the pulsewidth W1 of the impulse train M1 of above-mentioned generation and actual pulse group M2 and the size of default pulsewidth WH, regular according to default self-inspection, carry out self-inspection.
Preferably, said method also comprises: show self-detection result in keying mode.
Preferably, above-mentioned self-inspection rule is:
When the magnitude of voltage V of voltage signal is less than threshold voltage VH, extremely, generation secondary commutating circuit or abnormal the reporting an error of major loop are pointed out and suspend start for secondary commutating circuit or major loop;
When the magnitude of voltage V1 of voltage signal is more than or equal to threshold voltage VH, when the difference of the pulsewidth W1 of the pulsewidth W2 of actual pulse group and the impulse train of generation is more than or equal to default pulsewidth WH simultaneously, inversion circuit is abnormal, generates abnormal the reporting an error of inversion circuit and points out and suspend start;
When the magnitude of voltage V1 of voltage signal is more than or equal to threshold voltage VH, when the difference of the pulsewidth W1 of the impulse train simultaneously generated and the pulsewidth W2 of actual pulse group is less than default pulsewidth WH, machine operation is normal, and startup self-detection terminates.
Preferably, said method is after production burst group M1, also record the sequence number n of the impulse train M1 of current generation, and be more than or equal to threshold voltage VH at the magnitude of voltage V1 of voltage signal, when the difference of the pulsewidth W1 of the impulse train simultaneously generated and the pulsewidth W2 of actual pulse group is less than default pulsewidth WH, perform following steps:
The impulse train M1 sequence number n of more current generation and the size of the impulse train number maximum N preset, if the impulse train sequence number n of current generation equals N, then startup self-detection terminates; If the impulse train sequence number n of current generation is less than N, then wait for that prefixed time interval T is to after date, generates next pulsewidth group M1;
Wherein, N be less than or equal to 5 positive integer.
Preferably, the impulse train M1 of above-mentioned generation comprises 5 impulse waves, and the pulsewidth of each impulse wave is 2us.
Preferably, above-mentioned default pulsewidth WH is 200ns.
Preferably, above-mentioned default time interval T is 200ns.
The present invention further discloses a kind of digital inverter type welder, comprise the master chip circuit, control circuit, the inversion circuit circuit that connect successively; Above-mentioned digital inverter type welder also comprises actual pulse width detection circuit; Wherein,
Above-mentioned master chip circuit, for production burst group M1, sends to control circuit; And gather the magnitude of voltage V of the voltage signal that above-mentioned inversion circuit circuit exports, and according to the size of above-mentioned magnitude of voltage V with the threshold voltage VH preset, and the pulsewidth W1 of impulse train M1 generated and the difference of pulsewidth W2 of actual pulse group M2 and the size of default pulsewidth WH, according to the self-inspection rule preset, self-inspection is carried out to digital inverter type welder;
Above-mentioned control circuit, for when receiving impulse train, generating drive singal, driving above-mentioned inversion circuit circuit working;
Above-mentioned actual pulse width detection circuit, for gathering the primary current signal that above-mentioned inversion circuit circuit exports, and converting actual pulse group M2 to, sending to above-mentioned master chip circuit.
Preferably, above-mentioned digital inverter type welder also comprises display floater, for showing the keying of self-detection result.
Preferably, above-mentioned master chip circuit comprises impulse train generation module, pulsewidth comparison module, magnitude of voltage comparison module and selftest module, wherein,
Above-mentioned impulse train generation module, for after the power-up, production burst group M1, sends to control circuit;
Above-mentioned pulsewidth comparison module, for the difference of pulsewidth W2 and the size of default pulsewidth WH of the pulsewidth W1 and actual pulse group M2 that compare the impulse train M1 of generation;
Above-mentioned magnitude of voltage comparison module, for gathering the magnitude of voltage V of the voltage signal that above-mentioned inversion circuit circuit exports, and the size of more above-mentioned magnitude of voltage V and default threshold voltage VH;
Above-mentioned selftest module, for the comparative result according to the self-inspection rule preset and above-mentioned pulsewidth comparison module and above-mentioned magnitude of voltage comparison module, carries out self-inspection to digital inverter type welder, and keying corresponding for self-detection result is sent to above-mentioned display floater.
Preferably, above-mentioned impulse train generation module, also for recording the sequence number n of the impulse train M1 of generation, and according to the impulse train number maximum N preset, judges whether current PRF group M1 is last impulse train; And when current PRF group M1 is not last impulse train, wait for that prefixed time interval T is to after date, generates next pulsewidth group M1.
Preferably, above-mentioned actual pulse width detection circuit, as chip or module, is integrated on above-mentioned control circuit.
The present invention automatically exports impulse train after the power-up and carries out self-inspection, time abnormal in loop, not only can determine rapidly guilty culprit loop, and can never damage IGBT.
Accompanying drawing explanation
Fig. 1 is the theory diagram of digital inverter type welder preferred embodiment one of the present invention;
Fig. 2 is the theory diagram of digital inverter type welder preferred embodiment two of the present invention;
Fig. 3 is the flow chart of digital inverter type welder startup self-detection method preferred embodiment one of the present invention;
Fig. 4 is the flow chart of digital inverter type welder startup self-detection method preferred embodiment two of the present invention.
In order to make technical scheme of the present invention clearly, understand, be described in further detail below in conjunction with accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, be the theory diagram of digital inverter type welder preferred embodiment one of the present invention; The present embodiment comprises: master chip circuit 10, control circuit 20, inversion circuit circuit 30 and actual pulse width detection circuit 40, wherein,
Master chip circuit 10, for production burst group M1, sends to control circuit 20; And gather the magnitude of voltage V of the voltage signal that inversion circuit circuit 30 exports, and according to the magnitude of voltage V of voltage signal and the size of default threshold voltage VH, and the pulsewidth W1 of impulse train M1 generated and the difference of pulsewidth W2 of actual pulse group M2 and the size of default pulsewidth WH, according to the self-inspection rule preset, carry out self-inspection;
Control circuit 20, for when receiving impulse train, generates drive singal, drives inversion circuit circuit 30 to work;
Inversion circuit circuit 30, for carrying out inversion, transformation and rectification to input current signal, and gives actual pulse width detection circuit 40 by the primary current signal feedback that obtains; The voltage signal obtained is fed back to master chip circuit 10;
Actual pulse width detection circuit 40, for converting the primary current received signal to actual pulse group M2, sends to master chip circuit 10.
As shown in Figure 2, be the theory diagram of digital inverter type welder preferred embodiment two of the present invention; The present embodiment comprises: master chip circuit 10, control circuit 20, inversion circuit circuit 30, actual pulse width detection circuit 40 and display floater 50; Wherein, the function of control circuit 20, inversion circuit circuit 30 and actual pulse width detection circuit 40 is identical with above-described embodiment one, no longer repeats, in the present embodiment herein:
Master chip circuit 10, comprises impulse train generation module 11, pulsewidth comparison module 12, magnitude of voltage comparison module 13 and selftest module 14, wherein,
Impulse train generation module 11, for after the power-up, production burst group M1, sends to control circuit 20; For recording the sequence number n of the impulse train M1 of generation, and according to the impulse train number maximum N preset, judge whether current PRF group M1 is last impulse train; And when current PRF group M1 is not last impulse train, wait for that prefixed time interval T is to after date, generates next pulsewidth group M1;
Pulsewidth comparison module 12, for comparing the difference of impulse train M1 and the size of default pulsewidth WH of actual pulse group M2 and the generation received;
Magnitude of voltage comparison module 13, for gathering the magnitude of voltage V of the voltage signal received, and the size of the magnitude of voltage V of comparative voltage signal and default threshold voltage VH;
Selftest module 14, for the comparative result according to the self-inspection rule preset and pulsewidth comparison module 12 and magnitude of voltage comparison module 13, carries out self-inspection to digital inverter type welder, and keying corresponding for self-detection result is sent to display floater 50;
Display floater 50, for showing the keying of the self-detection result received.
In one embodiment, actual pulse width detection circuit 40 as chip or module, can also be integrated on control circuit 20.
As shown in Figure 3, the flow chart of digital inverter type welder startup self-detection method preferred embodiment one of the present invention; In the present embodiment, make N=1, specifically comprise the following steps:
Step S201: welding machine powers on;
Step S202: master chip circuit 10 production burst group M1, sends to control circuit 20;
In the present embodiment, the impulse train M1 that master chip generates comprises 5 impulse waves, and the pulsewidth of each impulse wave is 2us; In other embodiments, the impulse wave number of impulse train M1 and pulsewidth can also be other data, can arrange as required;
Step S203: after control circuit 20 receives impulse train M1, generates drive singal, drives inversion circuit circuit working;
Step S204: inversion circuit circuit 30 pairs of input signals carry out inversion, transformation and secondary rectification, and give actual pulse width detection circuit 40 by the primary current signal feedback that obtains, voltage signal is fed back to master chip circuit 10;
Step S205: actual pulse width detection circuit 40 converts the primary current signal received to actual pulse group M2, sends to master chip circuit 10;
Step S206: master chip circuit 10 compares the magnitude of voltage V of the voltage signal received and the difference of pulsewidth W1 of the threshold voltage VH preset and the pulsewidth W2 of actual pulse group M2 received and the impulse train M1 of generation and the size of default pulsewidth WH;
If magnitude of voltage V1 is more than or equal to threshold voltage VH, and the difference of the pulsewidth W1 of impulse train generated and the pulsewidth W2 of actual pulse group is more than or equal to default pulsewidth WH; Then perform step S207; If the magnitude of voltage V of the voltage signal received is less than threshold voltage VH; Then perform step S208; Otherwise, perform step S209;
In the present embodiment, presetting pulsewidth WH is 200ns;
Step S207: inversion circuit is abnormal, generate abnormal the reporting an error of inversion circuit and point out and suspend start, this self-inspection terminates;
In the present invention, suspend start, refer to the output activity stopping all forms, wait for user's process.
Step S208; Extremely, generation secondary commutating circuit or abnormal the reporting an error of major loop are pointed out and suspend start, and this self-inspection terminates for secondary commutating circuit or major loop;
Step S209: machine operation is normal, and this self-inspection terminates.
Occur because single self-inspection may have undetected situation, therefore present invention also offers the embodiment of repeatedly self-inspection, to improve self-inspection reliability.
As shown in Figure 4, the flow chart of digital inverter type welder startup self-detection method preferred embodiment two of the present invention; In the present embodiment, make N=5, specifically comprise the following steps:
Step S301: welding machine powers on;
Step S302: master chip circuit 10 production burst group M1, and record the sequence number n of current PRF group, send to control circuit 20;
In the present embodiment, the impulse train M1 that master chip generates comprises 5 impulse waves, and the pulsewidth of each impulse wave is 2us; In other embodiments, the impulse wave number of impulse train M1 and pulsewidth can also be other data, can arrange as required;
Step S303: after control circuit 20 receives impulse train M1, generates drive singal, drives inversion circuit circuit working;
Step S304: inversion circuit circuit 30 pairs of input signals carry out inversion, transformation and secondary rectification, and give actual pulse width detection circuit 40 by the primary current signal feedback that obtains, voltage signal is fed back to master chip circuit 10;
Step S305: actual pulse width detection circuit 40 converts the primary current signal received to actual pulse group M2, sends to master chip circuit 10;
Step S306: master chip circuit 10 compares the magnitude of voltage V of the voltage signal received and the difference of pulsewidth W1 of the threshold voltage VH preset and the pulsewidth W2 of actual pulse group M2 received and the impulse train M1 of generation and the size of default pulsewidth WH; If magnitude of voltage V1 is more than or equal to threshold voltage VH, the difference of the pulsewidth W1 of the pulsewidth W2 of actual pulse group M2 and the impulse train M1 of generation is more than or equal to default pulsewidth WH simultaneously, then perform step S307; If the magnitude of voltage V of the voltage signal received is less than threshold voltage VH, then perform step S308; Otherwise, perform step S309;
In the present embodiment, presetting pulsewidth WH is 200ns;
Step S307: inversion circuit is abnormal, generate abnormal the reporting an error of inversion circuit and point out and suspend start, show the abnormal corresponding keying of inversion circuit, this self-inspection terminates simultaneously;
Step S308; Extremely, generation secondary commutating circuit or abnormal the reporting an error of major loop are pointed out and suspend start for secondary commutating circuit or major loop, and show secondary commutating circuit or the abnormal corresponding keying of major loop, this self-inspection terminates simultaneously;
Step S309: judge whether the sequence number n of current PRF group is less than or equal to 5, if be less than 5, then performs step S310; If equal 5, then perform step S311;
Step S310: wait for that prefixed time interval T is to after date, proceed to step S301 and perform;
In the present embodiment, prefixed time interval T is 200ns;
Step S311: machine operation is normal, and show the keying of correspondence working properly, this self-inspection terminates.
The present invention automatically exports impulse train when starting shooting and carries out self-inspection, and because pulse width is narrow, even if occur abnormal, the immediate current flowing through IGBT also can not damage IGBT.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (12)
1. a digital inverter type welder startup self-detection method, it is characterized in that, described method is:
After welding machine powers on, production burst group M1, controls self inversion circuit work;
Gather the primary current signal of inversion circuit output and the magnitude of voltage V of voltage signal, and convert described primary current feedback signal to actual pulse group W2;
According to the magnitude of voltage V of described voltage signal and the size of threshold voltage VH preset, and the difference of the pulsewidth W2 of the pulsewidth W1 of the impulse train M1 of described generation and actual pulse group M2 and the size of default pulsewidth WH, regular according to default self-inspection, carry out self-inspection.
2. digital inverter type welder startup self-detection method as claimed in claim 1, it is characterized in that, described method also comprises:
Self-detection result is shown in keying mode.
3. digital inverter type welder startup self-detection method as claimed in claim 1, it is characterized in that, described self-inspection rule is:
When the magnitude of voltage V of voltage signal is less than threshold voltage VH, extremely, generation secondary commutating circuit or abnormal the reporting an error of major loop are pointed out and suspend start for secondary commutating circuit or major loop;
When the magnitude of voltage V1 of voltage signal is more than or equal to threshold voltage VH, when the difference of the pulsewidth W1 of the pulsewidth W2 of actual pulse group and the impulse train of generation is more than or equal to default pulsewidth WH simultaneously, inversion circuit is abnormal, generates abnormal the reporting an error of inversion circuit and points out and suspend start;
When the magnitude of voltage V1 of voltage signal is more than or equal to threshold voltage VH, when the difference of the pulsewidth W1 of the impulse train simultaneously generated and the pulsewidth W2 of actual pulse group is less than default pulsewidth WH, machine operation is normal, and startup self-detection terminates.
4. digital inverter type welder startup self-detection method as claimed in claim 3, it is characterized in that, described method is after production burst group M1, also record the sequence number n of the impulse train M1 of current generation, and be more than or equal to threshold voltage VH at the magnitude of voltage V1 of voltage signal, when the difference of the pulsewidth W1 of the impulse train simultaneously generated and the pulsewidth W2 of actual pulse group is less than default pulsewidth WH, perform following steps:
The impulse train M1 sequence number n of more current generation and the size of the impulse train number maximum N preset, if the impulse train sequence number n of current generation equals N, then startup self-detection terminates; If the impulse train sequence number n of current generation is less than N, then wait for that prefixed time interval T is to after date, generates next pulsewidth group M1;
Wherein, N be less than or equal to 5 positive integer.
5. the digital inverter type welder startup self-detection method as described in any one of claim 1-4, it is characterized in that, the impulse train M1 of described generation comprises 5 impulse waves, the pulsewidth of each impulse wave is 2us.
6. digital inverter type welder startup self-detection method as claimed in claim 3, it is characterized in that, described default pulsewidth WH is 200ns.
7. digital inverter type welder startup self-detection method as claimed in claim 4, is characterized in that, described default time interval T is 200ns.
8. a digital inverter type welder, comprises the master chip circuit, control circuit, the inversion circuit circuit that connect successively; It is characterized in that, described digital inverter type welder also comprises actual pulse width detection circuit; Wherein,
Described master chip circuit, for production burst group M1, sends to control circuit; And gather the magnitude of voltage V of the voltage signal that described inversion circuit circuit exports, and according to the size of described magnitude of voltage V with the threshold voltage VH preset, and the pulsewidth W1 of impulse train M1 generated and the difference of pulsewidth W2 of actual pulse group M2 and the size of default pulsewidth WH, according to the self-inspection rule preset, self-inspection is carried out to digital inverter type welder;
Described control circuit, for when receiving impulse train, generating drive singal, driving described inversion circuit circuit working;
Described actual pulse width detection circuit, for gathering the primary current signal that described inversion circuit circuit exports, and converting actual pulse group M2 to, sending to described master chip circuit.
9. digital inverter type welder as claimed in claim 8, is characterized in that, described digital inverter type welder also comprises display floater, for showing the keying of self-detection result.
10. digital inverter type welder as claimed in claim 9, is characterized in that, described master chip circuit comprises impulse train generation module, pulsewidth comparison module, magnitude of voltage comparison module and selftest module, wherein,
Described impulse train generation module, for after the power-up, production burst group M1, sends to control circuit;
Described pulsewidth comparison module, for the difference of pulsewidth W2 and the size of default pulsewidth WH of the pulsewidth W1 and actual pulse group M2 that compare the impulse train M1 of generation;
Described magnitude of voltage comparison module, for gathering the magnitude of voltage V of the voltage signal that described inversion circuit circuit exports, and the size of more described magnitude of voltage V and default threshold voltage VH;
Described selftest module, for the comparative result according to the self-inspection rule preset and described pulsewidth comparison module and described magnitude of voltage comparison module, carries out self-inspection to digital inverter type welder, and keying corresponding for self-detection result is sent to described display floater.
11. digital inverter type welders as claimed in claim 10, it is characterized in that, described impulse train generation module, also for recording the sequence number n of the impulse train M1 of generation, and according to the impulse train number maximum N preset, judge whether current PRF group M1 is last impulse train; And when current PRF group M1 is not last impulse train, wait for that prefixed time interval T is to after date, generates next pulsewidth group M1.
12. digital inverter type welders as claimed in claim 8, is characterized in that, described actual pulse width detection circuit, as chip or module, is integrated on described control circuit.
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| CN105458460B (en) | 2017-07-25 |
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